Product Catalogue. Oil seals

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1 Product Catalogue Oil seals

2 2 Herlev Bramming

3 Contents Page Introduction 4 Oil seal function 4 Sealing principle 4 Standard oil seals 5 DIN Conversion table 6 Dimensions and designations 6 Technical data 7 Choice of sealing material 7 Determining the right elastomer 7 Metal case 8 Spring 8 Pressure 8 Speed 8 Choice of correct lubricant 9 Leakage 9 Causes of leakage problems 10 Friction loss 10 Design and installation 11 Design of shaft and housing 11 Shaft 11 Housing 12 Fitting standard oil seals 12 Oil seals for special applications 13 Oil seals for pressure applications 13 Radial seals 14 Fitting radial seals 14 Split seals 15 Fitting split seals 15 Storage 16 Troubleshooting 17 Guide for choosing the correct oil seal 18 Herlev Bramming

4 Introduction Betech was founded in 1922 and is today one of the market's leading suppliers of gaskets, seals, mouldings, bellows, vibration dampers, and sheet and plate work. We offer a wide range of seals, including: Oil seals V-rings Gamma rings Bonded seals Sealing profiles O-rings X-rings D-rings Square seals Backup rings This catalogue provides relevant technical information on oil seals. The information is based on our own experience and should therefore be considered as rough, general, non-binding guidelines. We offer standard oil seals of type DIN 3760 with outside diameters of up to 1000 mm and radial seals with outside diameters of up to 2400 mm. Besides standard rubber qualities, we offer highly developed special compounds suitable for demanding media and working conditions. We can also develop new materials to meet customerspecific needs. Oil seal function Oil seals are one of the most commonly used seals for dynamic sealing tasks. Oil seals are generally used to prevent oil from leaking in rotating applications, but can also be used in special circumstances to seal against leakage of other liquids, gases, powders and granules. To ensure that the oil seal is given optimum working conditions, thus prolonging its service life as much as possible, it is important that the shaft surface complies with the recommended limits. To seal ball bearings and gears and to prevent leakage of lubricant and gases or ingress of dirt and dust, it is also crucial that the oil seal is designed correctly and made of suitable material. Sealing principle The area between the sealing lip and shaft is a critical part of oil seal design. The oil seal is pressed into a bearing housing, providing the required interference between the housing and the outer surface of the seal. The oil seal is thus prevented from rotating and forms a static seal. The sealing lip is equipped with a garter spring, which presses the lip against the shaft with a welldefined pressure, optimising sealing efficiency and durability. A thin film of fluid is formed between the sealing edge and shaft. Due to capillary force and the surface topography of the shaft, the fluid being sealed forms a meniscus under the sealing lip and is thus prevented from leaking. Metal case Outer sealing surface Outer sealing surface Garter spring Dust lip Spring groove Front face of sealing lip Sealing edge Rear face of sealing lip 4 Herlev Bramming

5 Standard oil seals DIN 3760 All our oil seals conform to the German DIN 3760 standard and the ISO 9002 quality standard. DIN 3760 describes general requirements on oil seal design, dimensions and tolerances. Betech designation SC Description Equipped with rubber sheath, allowing use in applications with rough surfaces or high thermal expansion. Suitable for sealing against low-viscosity and gaseous media. Easily replaced as fretting corrosion is prevented. TC As type SC but with dust lip.* SB2 Oil seal with metal case and vulcanised sealing lip. Requires smoother surface than type SC to achieve outer surface tightness. Often replaced by type SC. TB2 As type SB but with dust lip.* SA2 Oil seal with metal case similar to type SB but with additional reinforcement. Used primarily for large shaft diameters. TA2 As type SA but with dust lip.* * Recommended for sealing against dirt, dust and moisture on air side. DC Double sealing lip with two springs. Herlev Bramming

6 Metal case As standard, the oil seal case is made of plain carbon steel and treated to prevent corrosion. Some special applications require a stainless steel case however. Spring As standard, oil seals are supplied with a galvanised steel spring. Springs are, however, also available in stainless steel, acid-resistant steel, bronze or elastomer. Conversion table DIN Betech Simrit- Freudenberg Gaco Dichtomatic Kako Simmerwerke Eriks SKF 3760A SC BA A WA DG A R HSM5 3760B SB2 B1 ABI WB DF B M CRW1 3760C SA2 B2 WC DFK C GV CRSH1 3760AS TC BASL FA WAS DGS ASL RST HMSA BS TB2 B1SL WBS DFS BSL MST CRWA1 3760CS TA2 BSSL WCS DFSK CSL GVST CRSHA1 3760AS-P TCV BABSL WASY RST-D Dimensions and designations Oil seal dimensions are specified as shown in the example below: b Oil seal: Type: Material: OTR SC NBR Shaft diameter: d 1 = 35 mm Outside diameter: d 2 = 45 mm Width: b = 7 mm d 1 d 2 Stainless steel: SS Designation: OTR SC NBR SS 6 Herlev Bramming

7 Technical data Choice of sealing material Oil seals consist of a case and sealing lip. The case is made of either plain carbon steel or stainless steel while the sealing lip is made of elastomer. Which material is most suitable? The choice of material depends on temperature, shaft speed, medium and the surrounding environment. As standard, the sealing lip is made of oil-resistant NBR rubber. If, however, the seal is to be used in applications with high shaft speeds or aggressive media, a wide range of other materials that are more suitable for such conditions is also available. Determining the right elastomer NBR Acrylonitrile Butadiene Rubber NBR has low compression set and good resistance to hydraulic oils, diesel oils and mineral greases. As it can withstand neither ozone nor UV radiation, the material is unsuitable for outdoor applications. As NBR is a very gas-tight material, it is often used in applications involving gas. Brand name: Nitrile, BunaN Temperature range: 35 C to +120 C in oil / +90 C in water FPM Fluorelastomer FPM has excellent resistance to mineral oils, aliphatic, aromatic and chlorinated hydrocarbons, concentrated and dilute acids and a wide variety of other chemicals. It is also resistant to ageing, ozone and weathering. On the other hand, FPM becomes inflexible in cold environments and has relatively poor resistance to polar liquids (ketones, ethers and esters). Brand name: Viton Temperature range: 15 C to +200 C Q Silicone This elastomer can withstand both high and low temperatures and has low compression set. Silicone is resistant to sunlight, oxygen, UV radiation and dry heat but cannot withstand most petroleum-based liquids, ketones (e.g. MEK and acetone), steam or ether. Silicone is not gas-tight. Silicone is not recommended for applications in which it comes into contact with hydrocarbons like petrol or paraffin or steam at pressures over 3.5 bar. Temperature range: 60 C to +200 C ACM Polyacrylate This elastomer is suitable for high temperatures and mineral oils and is also ideal for oil additives, especially sulphur additives used for lubrication purposes under extreme pressures. ACM has good resistance to ozone, weathering and oxidation. ACM is often used in applications that combine high temperature and oil. Temperature range: 20 C to +130 C Maximum temperature ( C) of sealing medium Elastomer Min. temp. Engine oil Gearbox oil SAE Hypoid oil ATF oil Grease Petrol Water Lye Brake fluid NBR ACM * * Q * * * FPM * * - The elastomer is not resistant to these media. * No guarantee of elastomer tightness can be given for these media. Herlev Bramming

8 Resistance table, elastomers Resistance NBR ACM VMQ FPM HNBR PTFE Wear High temperature 3 Max. 100 C 2 Max. 150 C 1 Max. 180 C 1 Max. 200 C 2 Max. 150 C 2 Max. 200 C Low temperature Down to 40 C Down to -30 C Down to -50 C Down to -15 C Down to -40 C Down to -80 C Oil (+ high temperature) 2 (max. 80 C in heavy-duty oils) 2 3 (max. 150 C operating temperature) (max. 140 C operating temperature) Chemicals Price level Economical More expensive than NBR Relatively expensive Expensive 1= excellent 2 = good 3 = limited 4 = not recommended 1 Metal case The metal case or metal insert stiffens and strengthens the seal. Metal cases designed for standard oil seals are unsuitable for axial loads. In applications where the oil seal is exposed to axial loads, it is recommended that the seal be equipped with a specially designed metal case. Usually, the case is made of cold-rolled steel sheet (AISI 1008, DIN 1624). In applications that require protection against corrosion or chemical attack, metal cases of stainless steel (AISI 304, DIN ) can be used. Spring As standard, oil seals are equipped with galvanised steel spring. For applications where the seal must be capable of withstanding water or particularly aggressive liquids, springs of stainless steel, acid-resistant steel, bronze or elastomer are also available. If rubber is subjected to heat, loads or chemicals, it will gradually lose its initial properties. In other words, the rubber ages. The purpose of the spring is to ensure that the oil seal retains its initial radial strength. Galvanised spring steel SAE 1074, DIN Stainless spring steel AISI 304, DIN Pressure If the internal pressure is low or non-existent (less than 0.5 bar), a standard oil seal of type DIN A, B or C should be used. Oil seals which are suitable for applications with pressures of up to 10 bar can, however, also be designed. Speed The peripheral speed, rotational speed and diameter of the shaft are important parameters when choosing the most suitable elastomer. Shaft peripheral speed [V] is specified in m/s and calculated as follows: V = d 1 x R x π V: shaft peripheral speed [m/s] d 1 : shaft diameter [mm] R: rotational speed [rpm] For guidance purposes, the diagram below indicates general guidelines for choice of elastomer at specific peripheral and rotational speeds. peripheral speed, shaft (m/s) mm shaft diameter (mm) rotational speed, shaft (rpm) 8 Herlev Bramming

9 Choice of correct lubricant To prevent leakage, a 1-3 µm thick layer of lubricant is required between the sealing edge and shaft. Leakage Leakage can be categorised and defined in various ways. The lubricant provides a film of liquid that forms an interface between air on the one side and liquid on the other. If the liquid film is broken, leakage may result. To obtain minimum friction, there must be a film of liquid between the sealing lip and shaft. The film acts as a lubricant, preventing friction and heat generation. The lower the temperature, the longer the expected service life of the seal. The sealing lip must never be allowed to dry completely. When used to seal oil or grease, the seal will seldom dry out. Similarly, oil seals adjacent to ball bearings will normally be lubricated sufficiently by the ball bearing lubricant. When used to seal nonlubricating media, the seal should be lubricated with oil or grease before fitting. With two-lipped or double seals, the space between the two sealing lips must be filled with grease prior to fitting. Note though that the oil seal must be fitted in such a way as to prevent the creation of overpressure when applying the lubricant. To prolong oil seal service life, a certain amount of leakage should be accepted. In practice, however, such leakage will be so small as to be immeasurable. If an oil seal is allowed to dry out, it will very quickly rupture. Watertight: Damp: Wet: Measurable leakage: Temporary leakage: Apparent leakage: No liquid present on shaft. Beads of moisture near the sealing edge reduce sealing efficiency, but the other side of the surface area remains unaffected. Beads of moisture, which also spread to the other side of the surface area. Drops of liquid form but do not drip. Small beads of moisture on outer surface of housing, originating from rear side of seal. A transient problem with the sealing system, caused for example by small particles of dirt accumulating beneath the sealing edge. Such particles will be dislodged by subsequent use. A problem caused by the lubricant between sealing edge and dust lip. The lubricant overflows, giving the impression of leakage on the outer face. Herlev Bramming

10 Causes of leakage problems Tolerances concerning the interference between the outer surface of the seal and the bearing housing have been exceeded. The rubber has cracked because operating parameters have been exceeded. The rubber has hardened because operating parameters have been exceeded or because it is incompatible with the media being sealed. Corrosion of shaft up to sealing edge. Insufficient lubrication: Seal has dried out and sealing edge become worn. Lumps of oil have formed at the sealing edge. Excessive vibration of unit and shaft prevent lip from forming tight seal. Sealing lip permanently contaminated with dirt arising from inside or outside the chamber. Seal damaged in connection with handling or fitting. Friction loss power loss (hp) 0,6 0,5 0,4 0,3 0,2 0,1 0,0 ø80 ø70 ø60 ø50 ø40 ø30 ø20 ø shaft speed (rpm) shaft diameter (mm) Friction loss Friction not only has consequences for the oil seal sealing lip. Excessive friction may also cause unintended power loss from the system. Some friction loss is inevitable as the sealing principle of oil seals is based on the friction arising between the sealing lip and shaft where the two components are separated by a very thin film of liquid. For any given shaft diameter and rotation speed, the friction coefficient depends on the friction between the actual oil seal and the shaft. Measuring the precise amount of friction loss is difficult. However, the diagram in the next column illustrates the relationship between power loss, shaft diameter and shaft speed for standard oil seals with standard high-quality oil (SAE 30) at 100 C. 10 Herlev Bramming

11 Design and installation Design of shaft and housing Shaft Shaft surface finish is critical for the efficiency and service life of the oil seal. It is important that the shaft be free of helical grooves as these can transport the medium along the shaft and cause leakage. The problem can be prevented by rolling or plunge grinding the shaft surface. If the shaft is to be fitted in direction y, it must be chamfered as indicated in the table below. chamfer At the sliding surface, shaft diameter [d1] must have ISO h11 tolerance. The recommendations below will help prevent the oil seal from being damaged during fitting: If the shaft is to be fitted in direction z, any edges should be rounded as follows: r min. = 0.6 mm for oil seals without dust lip r min. = 1.0 mm for oil seals with dust lip fitting direction z fitting direction y Chamfer d 1 d 3 d 1 d 3 d 1 d 3 d 1 d 3 d 1 d 3 d 1 d All values are in mm Herlev Bramming

12 Recommended surface roughness To achieve optimum sealing efficiency, the surface roughness of the shaft in the sealing area must be: R a = 0.2 to 0.8 µm, R 2 = 1 to 5 μm, and R max = 6.3 μm. Shaft run-out 0,4 Low surface roughness When surface roughness is lower than recommended (especially in combination with high rotation speed) there is a serious risk that lubricant will be unable to reach the edge of the oil seal. This may cause premature ageing as the oil seal will be insufficiently lubricated. The rubber may become hard and brittle and begin to crack or fissure, and there may be signs of burning at the sealing edge. shaft run-out (mm) 0,3 0,2 0,1 0, shaft speed (rpm) Q NBR FPM ACM High surface roughness It is important that surface roughness is not too high as this may cause excessive wear of the oil seal, reducing its service life. High surface roughness also increases the risk of leakage. Concentricity 0,4 Hardness To ensure sufficient service life, shaft hardness should be at least 45 HRC. At speeds exceeding 4 m/s, or with impure or abrasive media, shaft hardness should be at least 55 HRC. Concentricity (mm) 0,3 0,2 0,1 Shaft run-out To achieve optimum sealing efficiency, it is important that shaft run-out is prevented and that the shaft is concentrically positioned in relation to the housing. As this is seldom possible in practice, compliance with the recommended values is important. Shaft run-out can be minimised by positioning the oil seal as close to the bearing as possible. 0, shaft diameter d1 (mm) Housing Steel and cast iron provide ideal surfaces for both rubber-coated and metal seals. For soft alloys (e.g. aluminium), rubber-coated seals are recommended. Metal seals cannot be recommended for bearing housings of plastic or nylon. Line of shaft centre rotation Shaft run-out Dynamic eccentricity Shaft run-out Rotation centre Shaft Max. shaft run-out Shaft Rotation centre Concentricity Bore centre-line Housing bore Housing bore The housing bore should have a diameter of [d 2 ] with ISO H8 tolerance and a surface roughness from R a = 1.6 to 6.3, R 2 = 10 to 20 μm and R max =25 µm. To facilitate fitting, a 5-10 chamfer is recommended. Fitting standard oil seals Before fitting an oil seal, it is important to check that it is clean and undamaged. The shaft must also be smooth and undamaged. Damage to the oil seal or shaft is namely the most common cause of leaks. 12 Herlev Bramming

13 Oil seals must be fitted concentrically, perpendicular to the shaft. It is recommended that a fitting tool be used in order to facilitate fitting and reduce the possibility of faults. The sealing lip should usually face the medium to be sealed and must be able to move freely. Oil seals for special applications If the required sealing design cannot be achieved using a standard solution, special oil seals are also available. Oil seals for pressure applications Standard oil seals are primarily designed for nonpressure applications. At peripheral speeds of less than 8 m/s, standard oil seals can, however, usually withstand pressures of up to 0.5 bar. At pressures greater than 0.2 bar and high peripheral speeds or pressures greater than 0.5 bar and low peripheral speeds, backup rings or specially designed oil seals should be used. Although backup rings can be used together with oil seals, we recommend the use of our specially designed oil seals for pressure applications. Betech designation SCV Description Reinforced sealing lip designed for overpressure Oil seals for pressure applications are also suitable in situations where pressure periodically fluctuates as the sealing lip prevents suction from the air side. In applications where low atmospheric pressure is part of the problem complex, the use of two oil seals is recommended, one with its sealing lip facing the air side. The higher the pressure and shaft speed, the shorter will be the service life of the oil seal. Diagram: Oil seal type TCV. Permissible overpressure. pressure (bar) shaft diameter (mm) rpm Oil seals are also available to order with specially reinforced sealing lip capable of withstanding pressures higher than those indicated in the diagram. TCV Reinforced sealing lip designed for overpressure, with dust lip If a backup ring is used in the application, a standard oil seal can be used. Type TCV is recommended in such cases. The maximum permissible pressure depends mainly on shaft speed, temperature and lubrication. Oils seals for pressure applications are characterised by a short, yet flexible, sealing lip. This particular design prevents surface pressure from increasing, thus limiting friction between the sealing lip and shaft. Herlev Bramming

14 Radial seals Radial seals are rubber oil seals reinforced with fabric rather than metal. Radial seals are designed to seal ball bearings in rolling plants, paper mills, heavy-duty gearboxes and offshore applications. As standard, radial seals are made of NBR, but are also available in FPM. Advantages: - Precision machining of housing not necessary. - Easy fitting. - No problems with corrosion. - Easy replacement. Four types of radial seal are available, either split or unsplit: Fitting radial seals Radial seals are manufactured with an overdimensioned outside diameter [O/D]. The bearing housing must be equipped with a plate whose purpose is to exert a controlled axial pressure on the seal, thus ensuring that it remains precisely positioned within the housing. Shaft Tolerance of shaft diameter: ISO h9 Surface roughness: R 2 = 4 μm Surface hardness: min. 55 HRC Housing Bore diameter: ISO H8 Surface roughness: R 2 = 16 μm Betech designation D5 D5S Description Standard profile with fabric insert reinforcement and grooves for ensuring optimum lubrication of sealing lip when fitted back to back As D5 but with dust lip. Plate D6 Similar to D5 but with grooves on entire profile. d: Nominal shaft diameter D: Nominal bore diameter H: Seal height L: Nominal bore depth D7 With ring-shaped flange in addition to grooves. Split radial seals must be fitted with the seam at the top. Radial seals should not be used in applications where the static liquid level is higher than the lowest point of the seal. In applications where two radial seals are fitted, the seams should be displaced 30 to either side of the shaft top. The bearing housing and shaft should be chamfered in order to facilitate trouble-free fitting 14 Herlev Bramming

15 of the seal. The length and angle of the chamfer should comply with the following drawing and diagram: b a Split seals are used in applications where standard unsplit seals cannot be fitted over the end of the shaft because of flanges or bearings. Split seals can also be used to minimise strip-down costs. Fitting split seals Shaft Tolerance of shaft diameter: ISO h9 Surface roughness: R a = 0.5 μm Surface hardness: min. 55 HRC 20 Housing Bore diameter in compliance with the following table: shaft chamber length (a) a b shaft diameter bore chamber length (b) Split seals Split seals are dynamic seals with no metal case but with a metal spring and split design. Shaft diameter (d) Bore diameter (D) Tolerance >140 mm ±0.12 ± ±0.15 ± ±0.15 ± ±0.20 ±0.12 < 450 mm ±0.20 ±0.15 Bore depth (L) Tolerance Split seals should be fitted with the seam on top of the shaft. They should not be used in applications where the static liquid level is higher than the lowest point of the seal. Clean the housing bore and remove all swarf and rough edges. Stretch the garter spring around the shaft. Join the ends of the spring by screwing the conical end into the hollow end. Position the split seal around the shaft and then stretch the garter spring into the groove. Compress the split seal slightly against the shaft to allow it to be inserted into the bearing housing. Begin easing the seal into the housing at the seam and press it into position all the way round. The bearing housing must be equipped with a plate which exerts a controlled axial pressure on the seal, thus ensuring that it remains precisely positioned within the housing. Herlev Bramming

16 Storage To prevent the material from ageing, the following guidelines should be observed when storing oil seals. In our experience, oil seals are best stored in a dry, dark and dust-free place at a temperature of between +15 C and +25 C. It is also important to avoid storing the seals in the vicinity of ozone sources, e.g. electric machinery and direct sunlight. High humidity may cause some elastomers to deteriorate and metal cases and springs to rust. Oil seals should never be hung on nails or the like for storage. Wherever possible, they should be stored horizontally in their original packaging until being fitted. When oil seals are replaced, always follow the first in, first out principle so as to avoid some seals being stored for an excessive length of time. 16 Herlev Bramming

17 Troubleshooting Oil seals may leak at either of two critical points. One is located between the outer surface of the oil seal and the housing (static), the other between the sealing lip and the shaft (dynamic). The table below summarises the various causes of leaks and our recommendations for remedying the problem. Fault Cause Remedy Oil seal rotates with shaft. Oil seal moves axially with shaft. Outside diameter of oil seal less than diameter of housing. Outside diameter of oil seal less than diameter of housing. Excess pressure causes oil seal to move axially. Oil seal becomes deformed. Inside diameter of oil seal too small. Check size of shaft. Replace oil seal with one of correct size. Replace oil seal with one of correct size. Damaged oil seal surface. Incorrect tool used for fitting. Use correct tool for fitting. Damaged sealing lip. Insufficient lubrication. Lubricate sufficiently. Sealing lip partially damaged. Sealing lip hard, cracked and worn. Design hampers lubricant transport to oil seal. Oil seal not concentrically aligned in relation to housing. Excessive temperature, speed or pressure. Insufficient lubrication. Change design to allow sufficient lubricant transport to oil seal. Centre oil seal using correct tool. Choose correct rubber compound and oil seal type. Lubricate sufficiently. Sealing lip swollen. Incorrect choice of rubber compound. Choose correct rubber compound. Sealing lip scratched. Surface roughness of shaft too high. Check surface roughness. Incorrect tool used for fitting. Use correct tool for fitting. Sealing lip collapsed. Oil seal incorrectly fitted. Ensure correct fitting. Excessive pressure. Choose oil seal type suitable for high pressure. Flex section cracked. Excessive pressure. Choose oil seal type suitable for high Pressure exerted on flex section. pressure. Spring lost position in groove. Insufficient groove depth. Choose alternative design or use spring with smaller diameter. Oil seal incorrectly fitted. Incorrect chamfer angle. Ensure correct fitting. Use fitting sleeve or chamfer shaft. Leakage* Surface roughness too low/high. Alter surface roughness to recommended level. *Leakage problems: see also section "Leakage" Helical grooves, rust or other damage to shaft. Repair or replace shaft. Herlev Bramming

18 Guide for choosing the correct OIL SEAL Customer: Item no.: Application: Machine Transmission Other Vehicle engine Agriculture Date: Wheel axle Marine Drawing For reference only Sample For reference only Material specification Legislation Special design Type Size: Material: Additional req.: Annual consumption: Standard: DIN RMA JIS Acc. to customer specifications APQP PPAP Colour: GD (grind OD) PD (paint colour) ND (non GD/PD) GR (pre-greased) LF (low friction) Helix lip Monthly consumption: Actual service life: Expected service life: Shaft Diameter: Material: Surface roughness: Hardness: Chamfer: Horizontal Vertical Rotating Clockwise Anticlockwise Bi-directional Normal: rpm Shaft run-out: TIR Max.: Misalignment: Reciprocating Stroke length: Speed: Cycles/min rpm M/m Oscillating Degrees of arc Speed: Cycles/min Bore Diameter Material: Surface roughness: Depth: Installation: Medium Internal: External: Temperature: C / F Dry Wet Submerged Air Light dust Mud Thick dust Min.: Normal: Max.: Pressure: kg/cm 2 psi bar Normal: Max.: 18 Herlev Bramming

19 Guide for choosing the correct OIL SEAL Customer: Item no.: Application: Machine Transmission Other Vehicle engine Agriculture Date: Wheel axle Marine Drawing For reference only Sample For reference only Material specification Legislation Special design Type Size: Material: Additional req.: Annual consumption: Standard: DIN RMA JIS Acc. to customer specifications APQP PPAP Colour: GD (grind OD) PD (paint colour) ND (non GD/PD) GR (pre-greased) LF (low friction) Helix lip Monthly consumption: Actual service life: Expected service life: Shaft Diameter: Material: Surface roughness: Hardness: Chamfering: Horizontal Vertical Rotating Clockwise Anticlockwise Bi-directional Normal: rpm Shaft run-out: TIR Max.: Misalignment: Reciprocating Stroke length: Speed: Cycles/min: rpm M/m Oscillating Degrees of arc: Speed: Cycles/min: Bore Diameter: Material: Surface roughness: Depth: Installation: Medium Internal: External: Temperature: C / F Dry Wet Submerged Air Light dust Mud Thick dust Min.: Normal: Max.: Pressure: kg/cm 2 psi bar Normal: Max.: Herlev Bramming

20 Betech A/S Vesterlundvej 4 DK-2730 Herlev Betech A/S Industrivej 29 DK-6740 Bramming Tel Fax info@betech.dk Tel Fax See our catalogue collection on EN/ DK expresses the essence of our mission. Optimizing and enrichment of the customers products are our challenging goals.

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